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2016-07-01 16:31

soci

Registered: Sep 2003
Posts: 473

Help needed with R65C02 BBS/BBR timing verification

Hello all!

To improve VICE's R65C02 emulation I'm looking for testers with a FD2000/FD4000 drive.

Test is about the timing of BBR/BBS instructions. These are implemented as 5 cycle now, but I'm not sure if this is right. Data sheets, various documents and emulators disagree with each other of course.

Therefore I've made a small test program which measures it and will blink the LED of FD2000/4000 drive based on the results.

http://singularcrew.hu/temp/cmdfdbbtest.prg

The program needs to be loaded from the drive as it's using $ba to decide where to download. There will be 3 short blink sequences separated by a delay, then it restarts after a long delay. Unless I got it wrong ;)

If you have one of these drives and want to help please post the results here.

Thanks!

2016-07-23 22:36

soci

Registered: Sep 2003
Posts: 473

This problem was solved today, thanks to Fuvesi.

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